Ali 'Imran 3:140

إِن يَمۡسَسۡكُمۡ قَرۡحٞ فَقَدۡ مَسَّ ٱلۡقَوۡمَ قَرۡحٞ مِّثۡلُهُۥۚ وَتِلۡكَ ٱلۡأَيَّامُ نُدَاوِلُهَا بَيۡنَ ٱلنَّاسِ وَلِيَعۡلَمَ ٱللَّهُ ٱلَّذِينَ ءَامَنُواْ وَيَتَّخِذَ مِنكُمۡ شُهَدَآءَۗ وَٱللَّهُ لَا يُحِبُّ ٱلظَّـٰلِمِينَ 140

If a wound should touch you - there has already touched the [opposing] people a wound similar to it. And these days [of varying conditions] We alternate among the people so that Allah may make evident those who believe and [may] take to Himself from among you martyrs - and Allah does not like the wrongdoers